Boriding method of wear-resisting composite member

Abstract

The invention provides a boriding method of a wear-resisting composite member. The boriding method comprises the following steps: a) preheating the wear-resisting composite member by adopting a hot spray gun so as to rise the temperature of the surface of the wear-resisting composite member to be 800 DEG C-850 DEG C; b) spraying a boriding agent to the surface of the wear-resisting composite member obtained from the step a to obtain the wear-resisting composite member with the boronized surface. When the wear-resisting composite member is subjected to boriding, the wear-resisting composite member is preheated by using the hot spray gun, so that the temperature of the surface of a workpiece is high, the internal temperature of the workpiece is lower than the surface temperature of the workpiece, the brazing connection position of the composite member can not be affected, the connection strength of the composite member can not be affected, after the wear-resisting composite member is preheated, the boriding agent is sprayed to the surface of the composite member, the boriding agent is subjected to reaction under high temperature so as to generate active boron atoms, the active boron atoms combine with cobalt atoms and tungsten atoms melt in the surface, so as to form a compound, so that a boriding layer of a boron compound is formed.

Description

technical field [0001] The invention relates to the field of surface treatment of cemented carbide, in particular to a boronizing method for a wear-resistant assembly. Background technique [0002] Boronizing technology is a chemical heat treatment technology that infiltrates boron into the metal surface at high temperature to obtain a hard boronizing layer of boron compounds. The thickness of the infiltrated layer of this technology is 20um ~ 150um, the hardness of the infiltrated layer is close to that of cemented carbide, it has excellent anti-abrasive wear and anti-erosion performance, and can improve the chemical corrosion resistance of the material and the product life. Therefore, Boronizing technology is widely used in strengthening treatment of steel parts. [0003] The existing boronizing methods include solid boronizing, gas boronizing and liquid boronizing. The boronizing on the metal surface mainly adopts solid boronizing and liquid boronizing. Liquid boronizin...

AI Technical Summary

Problems solved by technology

This method forms a layer of chemical vapor deposition film coating on the surface of the alloy, which improves the wear resistance, corrosion resistance and service life of the alloy working surface, but the components are connected by brazing, and the wear-resistant components are solid During the boronizing process, the boronizing temperature is close to the brazing temperature, so after the overall boronizing, the welding area of ​​the assembly will be welded and peeled off, which will affect the connection strength of the assembly. At the same time, the cobalt diffused during the boronizing process is easy to deposit and hinder boron atoms. Infiltration and adhesion, thus affecting the effect of boronizing

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